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Defogging a swim mask is easy. You just spit into the face plate. It's the first thing kids learn to do when they get a mask, fins and snorkel set. They never seem to forget it. This old-fashioned method works just fine, and is a quick solution for divers who don't have their defoggers handy before they dip below the surface.
Here's a quick reminder on how to defog your mask: